EP2514654B1 - Elektrische Servolenkung - Google Patents

Elektrische Servolenkung Download PDF

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Publication number
EP2514654B1
EP2514654B1 EP20120158412 EP12158412A EP2514654B1 EP 2514654 B1 EP2514654 B1 EP 2514654B1 EP 20120158412 EP20120158412 EP 20120158412 EP 12158412 A EP12158412 A EP 12158412A EP 2514654 B1 EP2514654 B1 EP 2514654B1
Authority
EP
European Patent Office
Prior art keywords
casing
connector
electric motor
lid member
electric power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20120158412
Other languages
English (en)
French (fr)
Other versions
EP2514654A1 (de
Inventor
Tetsuro SHIMIZU
Takashi Gotou
Hideki Tanaka
Hiroki Masuda
Tatsunori Harao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Publication of EP2514654A1 publication Critical patent/EP2514654A1/de
Application granted granted Critical
Publication of EP2514654B1 publication Critical patent/EP2514654B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
    • H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel

Definitions

  • the present invention relates to an electric power steering apparatus for vehicle.
  • An electric power steering apparatus for assisting a steering wheel operation utilizing a rotational force of an electric motor is known as a power steering apparatus for assisting a steering wheel operation performed by a driver.
  • JP2001-31755A discloses an electric power steering apparatus with a motor unit in which a control board and a power device board are integrally provided to an electric motor.
  • a connector used to take wiring out to the outside and the control board need to be connected by wire in mounting the electric motor in a casing.
  • a work hole used to connect the control board and the connector by wire is formed in the casing in some cases.
  • a lid member needs to be mounted in the work hole to close the work hole.
  • the present invention aims to reliably mount a lid member for closing a work hole used for wire connection of a connector in the case of using a controller integrated electric motor.
  • the electric power steering apparatus includes an electric motor with a built-in controller for controlling rotation, a transmission mechanism for transmitting the rotation of the electric motor to the steering shaft, a connector used to pull out wiring from the controller to the outside, a first casing in which the connector and the electric motor are to be mounted and which includes an work hole used for a wire connection operation of the controller and the connector, a lid member for closing the work hole, and a second casing to be fixed to the first casing while housing the transmission mechanism.
  • the second casing including a cover part for covering the lid member in a state fixed to the first casing.
  • FIG. 1 is a front view of an electric power steering apparatus according to an embodiment of the present invention.
  • FIG. 2 is a rear view of the electric power steering apparatus of FIG. 1 .
  • FIG. 3 is a front view of an assist unit in the electric power steering apparatus.
  • FIG. 4 is a bottom view of the assist unit of FIG. 3 .
  • FIG. 5 is a right side view of the assist unit of FIG. 3 .
  • FIG. 6 is a sectional view of the assist unit cut along VI-VI line of FIG. 3 .
  • FIGS. 1 and 2 The entire construction of an electric power steering apparatus 100 according to an embodiment of the present invention is described with reference to FIGS. 1 and 2 .
  • the electric power steering apparatus 100 is installed in a vehicle to assist a steering wheel operation performed by a driver.
  • the electric power steering apparatus 100 includes a steering input shaft 1 to which a torque resulting from a steering wheel operation by the driver is input, an unillustrated steering output shaft coaxially coupled to the steering input shaft 1 via an unillustrated torsion bar and linked with wheels, a torque sensor 2 for detecting a torque acting on the torsion bar, and an assist unit 10 for giving an assist force corresponding to an output of the torque sensor 2 to the steering output shaft.
  • the steering input shaft 1 is a tubular shaft, one end of which is coupled to an unillustrated steering wheel at a driver's seat.
  • the torsion bar for detecting a torque is inserted into the inner periphery of the other end of the steering input shaft 1.
  • the torsion bar has one end fixed to the steering input shaft 1 and synchronously rotates with the steering input shaft 1.
  • the other end of the torsion bar is press-fitted into one end of the steering output shaft.
  • the steering output shaft is coupled to the steering input shaft 1 via the torsion bar and the steering input shaft 1 and the steering output shaft are relatively rotated by a twisted amount of the torsion bar.
  • the torque sensor 2 detects the torque acting on the torsion bar based on the twisted amount of the torsion bar.
  • An unillustrated steering pinion to be engaged with an unillustrated rack shaft mounted movably in an axial direction in a rack casing 3 fixed to the vehicle is provided on the outer periphery of the steering output shaft. This causes the rack shaft to move in the axial direction and the steered wheel coupled to the rack shaft via an unillustrated tie rod to be steered when the steering output shaft rotates.
  • a worm wheel 32 of a worm speed reducer 30 to be described later is fixed to the outer periphery on the other end of the steering output shaft. This causes the steering output shaft to rotate integrally with the worm wheel 32.
  • the torque sensor 2 is a noncontact sensor for detecting the twisted amount of the torsion bar based on a change in magnetic field. Besides, the torque sensor 2 may be a contact sensor such as a sensor using a potentiometer. The torque sensor 2 includes a connector 2a for outputting a signal corresponding to the detected torque.
  • assist unit 10 is described with reference to FIGS. 3 to 6 .
  • the assist unit 10 includes an electric motor 20 operating in correspondence with the output from the torque sensor 2, the worm speed reducer 30 as a transmission mechanism for transmitting a rotational force of the electric motor 20 to the steering output shaft while decelerating and amplifying it, and a connector 25 for taking out wiring from an ECU 21 built in the electric motor 20 to the outside.
  • the assist unit 10 assists steering of the steered wheel by the rotational force of the electric motor 20 transmitted via the worm speed reducer 30.
  • the assist unit 10 includes a first casing 40 with a work hole 41 used for a wire connection operation of the ECU 21 and the connector 25 in mounting the connector 25 and the electric motor 20, a lid member 45 for closing the work hole 41, and a second casing 50 in which the worm speed reducer 30 is housed and which is fixed to the first casing 40.
  • the electric motor 20 is driven by electricity supplied from an unillustrated power supply device of the vehicle and generates a rotational force for assisting the steering wheel operation by the driver.
  • the rotational force of the electric motor 20 is transmitted from an output shaft of the electric motor 20 to the worm speed reducer 30.
  • the ECU (Electronic Control Unit) 21 as a controller for controlling the rotation is built in the electric motor 20.
  • the ECU 21 is composed of a microcomputer including a CPU (Central Processing Unit), a ROM (Read-Only Memory), a RAM (Random Access Memory) and an I/O interface (Input/Output interface).
  • the RAM stores data in the processing of the CPU
  • the ROM stores a control program of the CPU and the like in advance
  • the I/O interface is used to input and output information to and from connected devices.
  • the ECU 21 is electrically connected to the torque sensor 2.
  • the ECU 21 controls an output of the electric motor 20 according to the torque detected by the torque sensor 2.
  • the connector 25 is a terminal for taking out the wiring from the ECU 21 to the outside.
  • An unillustrated power line electrically connected to the power supply device and an unillustrated signal line electrically connected to the connector 2a of the torque sensor 2 are connected to the connector 25. By this, power is supplied to the ECU 21 and a signal from the torque sensor 2 is input thereto.
  • the worm speed reducer 30 transmits the rotation of the electric motor 20 to a steering shaft via the steering output shaft.
  • the worm speed reducer 30 includes a worm 31 which rotates integrally with the output shaft of the electric motor 20, and the worm wheel 32 which is engaged with the worm 31 and outputs the rotation of the electric motor 20 while converting a rotational direction.
  • the worm 31 is a screw gear arranged coaxially with the output shaft of the electric motor 20.
  • the base end of the worm 31 is fixed to the output shaft of the electric motor 20.
  • the free end of the worm 31 is supported on the second casing 50 via an unillustrated bearing.
  • the worm wheel 32 is a helical gear whose central axis crosses that of the worm 31 and so arranged as to have a predetermined center distance. A drive force transmitted to the worm 31 is output while the rotational direction thereof is changed by the worm wheel 32.
  • the worm wheel 32 has the steering output shaft press-fitted into the inner periphery thereof and integrally rotates. This enables the rotational force of the electric motor 20 to be transmitted to the steering output shaft via the worm speed reducer 30 and the steering wheel operation by the driver to be assisted.
  • the first casing 40 is formed to have a substantially cylindrical shape with open opposite ends in the axial direction.
  • the first casing 40 includes a motor mounting part 42 which is open so that the electric motor 20 can be mounted, a connector mounting part 43 which is open in the same direction as the motor mounting part 42 and into which the connector 25 is to be mounted, a heat sink part 44 for radiating heat generated from the ECU 21 housed therein, and the work hole 41 formed on a side opposite to the motor mounting part 42 and the connector mounting part 43.
  • the motor mounting part 42 is in the form of a recess recessed in an axial direction of the first casing 40.
  • the motor mounting part 42 is shaped in conformity with the electric motor 20.
  • the electric motor 20 is mounted in the motor mounting part 42 and fixed by fastening screws 20a shown in FIG. 4 .
  • the motor mounting part 42 is formed with a through hole through which the output shaft of the electric motor 20 is inserted and which penetrates in the axial direction of the first casing 40.
  • the connector mounting part 43 is in the form of a recess formed on the outer periphery of the same surface as the one where the motor mounting part 42 is formed.
  • the connector 25 is mounted in the connector mounting part 43 and fixed by fastening a screw 25a shown in FIG. 4 .
  • the connector mounting part 43 communicates with the motor mounting part 42 in the first casing 40. This enables the ECU 21 of the electric motor 20 and the connector 25 to be connected by wire.
  • the heat sink part 44 is formed on an end part of the first casing 40 where the work hole 41 is formed.
  • the heat sink part 44 is made of a material with high heat radiation. Together with the through hole through which the output shaft of the electric motor 20 is inserted, the work hole 41 is formed in an end surface of the heat sink part 44 facing the second casing 50.
  • the first casing 40 may be integrally formed to include the heat sink part 44 instead of separately forming the heat sink part 44.
  • the work hole 41 is an arcuate hole formed along the outer periphery of the through hole through which the output shaft of the electric motor 20 is inserted.
  • the work hole 41 penetrates the first casing 40 in the axial direction and communicates with the connector mounting part 43.
  • the work hole 41 is used to insert a tool by an operator for the wire connection operation of the ECU 21 of the electric motor 20 and the connector 25.
  • the work hole 41 is open toward the second casing 50. Note that the wire connection of the ECU 21 and the connector 25 may be automatically performed using a facility instead of being manually performed by the operator.
  • the work hole 41 is provided only for connecting wires of the ECU 21 and the connector 25. Thus, the work hole 41 is closed by mounting the lid member 45 after the wire connection of the ECU 21 and the connector 25 is completed.
  • the lid member 45 is an arcuate plate having the same curvature as the work hole 41.
  • the lid member 45 has opposite circumferential ends fastened by a pair of screws 46 and is fixed to the first casing 40.
  • the lid member 45 is formed to be larger than the opening area of the work hole 41 and completely closes the work hole 41 in a state mounted on the first casing 40.
  • the second casing 50 includes a transmission mechanism housing part 51 for housing the worm speed reducer 30, a plurality of fastening parts 52 to be fastened to the first casing 40 by bolts 50a, and a cover part 55 for covering the lid member 45 in a state fixed to the first casing 40.
  • the transmission mechanism housing part 51 is shaped in conformity with the worm speed reducer 30 and houses the worm speed reducer 30. An opening is formed in an end surface of the transmission mechanism housing part 51 facing the first casing 40 so that the outer shaft of the electric motor 20 is insertable.
  • the fastening parts 52 are formed on an end part of the second casing 50 facing the first casing 40.
  • the fastening parts 52 are formed to bulge out from the outer periphery of the transmission mechanism housing part 51.
  • the fastening parts 52 are substantially cylindrical bosses each formed with a through hole through which a bolt 50a for fastening the second casing 50 and the first casing 40 is inserted.
  • the fastening parts 52 are formed at three positions on the outer periphery of the transmission mechanism housing part 51,
  • End surfaces of the fastening parts 52 are held in contact with the heat sink part 44 with the second casing 50 attached to the first casing 40.
  • generated heat from the ECU 21 is transmitted to the fastening parts 52 via the heat sink part 44.
  • the fastening parts 52 can fix the first casing 40 and the second casing 50 by the fastened bolts 50a if being formed at two or more positions.
  • the fastening parts 52 may be at as many positions as needed, not limited to three positions, as long as the positions are plural.
  • the cover part 55 is an arm formed at one of the three fastening parts 52 to straddle the lid member 45.
  • the cover part 55 may be provided not only at one fastening part 52, but also at two or more fastening parts 52. That is, the cover part 55 only has to be provided between at least one of the fastening parts 52 and the transmission mechanism housing part 51.
  • the cover part 55 is held in contact with the lid member 45 and presses the lid member 45 against the first casing 40 with the second casing 50 fixed to the first casing 40. This enables the lid member 45 to be reliably mounted on the first casing 40. Further, by covering the lid member 45 by the cover part 55, collision of a flying stone or the like from the outside with the lid member 45 while the vehicle is moving can be prevented.
  • Generated heat from the ECU 21 is transmitted to the cover part 55 from the heat sink part 44 via the fastening parts 52 and the lid member 45.
  • the generated heat from the ECU 21 can be radiated, since the entire surface of the cover part 55 is in contact with the air.
  • a heat radiation area increased by providing the cover part 55 improves heat radiation of the ECU 21 can be improved.
  • cover part 55 may be so formed as to be separated from the lid member 45 instead of being held in contact with the lid member 45. In this case as well, the cover part 55 covers the lid member 45, wherefore the lid member 45 can be reliably mounted on the first casing 40 and collision of a flying stone or the like from the outside with the lid member 45 while the vehicle is moving can be prevented.
  • an elastic member may be interposed in a clearance between the cover part 55 and the lid member 45. If the cover part 55 and the lid member 45 are directly in contact, the cover part 55 and the lid member 45 are required to have high dimensional accuracy. By interposing the elastic member, dimensional accuracy required for the cover part 55 and the lid member 45 is moderated.
  • the lid member 45 for closing the work hole 41 used for wire connection of the ECU 21 of the electric motor 20 and the connector 25 is pressed against the first casing 40 by the cover part 55 of the second casing 50 with the second casing 50 fixed to the first casing 40. Therefore, the lid member 45 can be reliably mounted on the first casing 40.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Power Steering Mechanism (AREA)

Claims (4)

  1. Elektrische Servolenkvorrichtung (100) zum Unterstützen von Lenkung eines gelenkten Rades, die umfasst:
    einen Elektromotor (20) mit einer eingebauten Steuereinrichtung (21) zum Steuern von Drehung;
    einen Übertragungsmechanismus (30) zum Übertragen der Drehung des Elektromotors (20) auf eine Lenkwelle;
    einen Verbinder (25), mit dem eine Verdrahtung von der Steuereinrichtung (21) verbunden ist;
    ein erstes Gehäuse (40), in dem der Verbinder (25) und der Elektromotor (20) installiert werden und das eine Arbeitsöffnung (41) enthält, die für einen Draht-Verbindungsvorgang der Steuereinrichtung (21) und des Verbinders (25) eingesetzt wird;
    ein Deckelelement (45) zum Schließen der Arbeitsöffnung (41) nach dem Draht-Verbindungsvorgang; und
    ein zweites Gehäuse (50), das an dem ersten Gehäuse (40) befestigt wird und dabei den Übertragungsmechanismus (30) aufnimmt,
    wobei der Verbinder (25) dazu dient, die Verdrahtung von der Steuereinrichtung (21) aus dem ersten Gehäuse (40) herauszuführen,
    dadurch gekennzeichnet, dass das zweite Gehäuse (50) einen Abdeckungsteil (55) enthält, mit dem das Deckelelement (45) abgedeckt wird, wenn das zweite Gehäuse an dem ersten Gehäuse (40) befestigt ist.
  2. Elektrische Servolenkvorrichtung (100) nach Anspruch 1, wobei:
    das zweite Gehäuse (50) enthält:
    einen Übertragungsmechanismus-Aufnahmeteil (51) zum Aufnehmen des Übertragungsmechanismus (30), und
    eine Vielzahl von Anbringungsabschnitten (52), die an dem ersten Gehäuse (40) angebracht werden; und
    wobei der Abdeckungsteil (55) ein Arm ist, der zwischen wenigstens einem der Anbringungsabschnitte (52) und dem Übertragungsmechanismus-Aufnahmeteil (51) ausgebildet ist.
  3. Elektrische Servolenkvorrichtung (100) nach Anspruch 1 oder Anspruch 2, wobei:
    das erste Gehäuse (40) enthält:
    einen Motor-Installationsteil (42), der offen ist, so dass der Elektromotor (20) installiert werden kann,
    einen Verbinder-Installationsteil (43), der in der gleichen Richtung offen ist wie der Motor-Anbringungsteil (42) und in dem der Verbinder (25) installiert wird; und
    wobei die Arbeitsöffnung (41) an einer Seite ausgebildet ist, die dem Motor-Installationsteil (42) sowie dem Verbinder-Installationsteil (43) gegenüberliegt und zu dem zweiten Gehäuse (50) hin offen ist.
  4. Elektrische Servolenkvorrichtung (100) nach einem der Ansprüche 1 bis 3, wobei:
    der Abdeckungsteil (55) in Kontakt mit dem Deckelelement (45) gehalten wird und das Deckelelement (45) an das erste Gehäuse (40) drückt, wenn das zweite Gehäuse (50) an dem ersten Gehäuse (40) befestigt ist.
EP20120158412 2011-03-22 2012-03-07 Elektrische Servolenkung Active EP2514654B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011062714A JP5613598B2 (ja) 2011-03-22 2011-03-22 電動パワーステアリング装置

Publications (2)

Publication Number Publication Date
EP2514654A1 EP2514654A1 (de) 2012-10-24
EP2514654B1 true EP2514654B1 (de) 2015-05-06

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ID=45894100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120158412 Active EP2514654B1 (de) 2011-03-22 2012-03-07 Elektrische Servolenkung

Country Status (4)

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US (1) US8485306B2 (de)
EP (1) EP2514654B1 (de)
JP (1) JP5613598B2 (de)
CN (1) CN102689648B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3039492B1 (fr) * 2015-07-31 2019-05-24 Jtekt Europe Dispositif de direction assistee avec calculateur deporte sous la cremaillere
JP7117204B2 (ja) * 2018-09-13 2022-08-12 日立Astemo株式会社 ステアリング装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2295590B (en) * 1994-11-30 1999-01-20 Nsk Ltd Electric power steering apparatus
JP4280881B2 (ja) 1999-07-23 2009-06-17 三菱瓦斯化学株式会社 ポリカーボネート樹脂溶液の精製方法
JP3774624B2 (ja) * 2000-10-18 2006-05-17 三菱電機株式会社 電動パワーステアリング装置
JP2004135492A (ja) * 2003-08-29 2004-04-30 Kayaba Ind Co Ltd 電動パワーステアリング装置の電動モータ
JP5011801B2 (ja) * 2006-04-11 2012-08-29 日本精工株式会社 電動パワーステアリング装置
WO2007119757A1 (ja) * 2006-04-11 2007-10-25 Nsk Ltd. 電動パワーステアリング装置及びその組付方法
JP5397658B2 (ja) * 2008-02-12 2014-01-22 株式会社ジェイテクト 車両用操舵装置及びそのサブアセンブリの移送方法
JP4623125B2 (ja) * 2008-04-07 2011-02-02 三菱電機株式会社 電動パワ−ステアリング用電動モ−タ装置および電動パワーステアリング装置
JP5365483B2 (ja) * 2009-04-09 2013-12-11 日本精工株式会社 電動パワーステアリング装置
JP5084783B2 (ja) * 2009-05-21 2012-11-28 三菱電機株式会社 電動式パワーステアリング装置
JP5390980B2 (ja) 2009-08-01 2014-01-15 ダイヤモンド電機株式会社 電動パワーステアリング用モータユニット及び電動パワーステアリング装置
JP2012006584A (ja) * 2010-05-28 2012-01-12 Jtekt Corp 電動パワーステアリング装置

Also Published As

Publication number Publication date
CN102689648A (zh) 2012-09-26
US8485306B2 (en) 2013-07-16
JP5613598B2 (ja) 2014-10-29
JP2012197036A (ja) 2012-10-18
US20120241245A1 (en) 2012-09-27
CN102689648B (zh) 2015-04-01
EP2514654A1 (de) 2012-10-24

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